Might be a Wayland bug after all:
jul 17 06:49:40 X1-carbon gnome-shell[3140]: XWAYLAND: mode -1x-1 is not available
... is the recurring error message (between lots of "thunderbird[3569]: Couldn't map window 0x7f4cbe67ab20 as subsurface because its parent is not mapped." and other processes that don't know where to put their windows)
Might be a Wayland bug after all:
jul 17 06:49:40 X1-carbon gnome-shell[3140]: XWAYLAND: mode -1x-1 is not available
... is the recurring error message (between lots of "thunderbird[3569]: Couldn't map window 0x7f4cbe67ab20 as subsurface because its parent is not mapped." and other processes that don't know where to put their windows)